$(function(){
  var $container = $('#masonry');
  $container.imagesLoaded(function() {
    $container.masonry({
      itemSelector: '.layui-box',
      gutter: 20,
      isAnimated: true,
    });
  });

  $(".layui-actions").hover(function(){
    $(this).addClass("on");
  },function(){
    $(this).removeClass("on");
  });

  $(window).scroll(function(){
    if($(window).scrollTop()>100){
      $('.layui-back').fadeIn(200);
    }else{
      $('.layui-back').fadeOut(200);
    }
  });
  $('#back').on('click',function(){
    $("html,body").animate({scrollTop:0},500);
  });
});
function GetCookie(c_name){
    if (document.cookie.length > 0)
    {
        c_start = document.cookie.indexOf(c_name + "=")
        if (c_start != -1)
        {
            c_start = c_start + c_name.length + 1;
            c_end   = document.cookie.indexOf(";",c_start);
            if (c_end == -1)
            {
                c_end = document.cookie.length;
            }
            return unescape(document.cookie.substring(c_start,c_end));
        }
    }
    return null
}
 
function SetCookie(c_name,value,expiredays){
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" +escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString()); //使设置的有效时间正确。增加toGMTString()
}